HP / Agilent 81625A High Power InGaAs Optical Head, 5mm

The HP/Agilent 81625A is a high power InGaAs optical head designed for precise optical power measurement across the near-infrared spectrum. Built around a 5 mm diameter InGaAs detector element, it delivers accurate measurements from -80 dBm to +20 dBm and maintains ±2.5% accuracy across the 950 nm to 1630 nm band under reference conditions (23°C ±5°C). The sensor exhibits excellent optical characteristics with low PDL, minimal spectral ripple, and high return loss—making it ideal for component-level optical testing. It integrates with Agilent’s 8163, 8164, 8166 series mainframes and 8163B, 8164B, 8166B variants through either the 81618A (single) or 81619A (dual) interface modules.

– Technical Specifications

• Sensor Element: InGaAs
• Detector Size: 5 mm diameter
• Wavelength Range: 850 nm to 1650 nm
• Power Measurement Range: -80 dBm to +20 dBm
• CW Linearity: +20 dBm to -60 dBm (950–1630 nm) at 23°C ±5°C
• Measurement Accuracy: ±2.5% (950–1630 nm reference conditions)
• Wavelength Uncertainty: ±4.0% (950–1630 nm)
• Applicable Fiber: Single-mode and multimode up to 100 µm core, NA < 0.3
• Physical: 8 × 6 × 4 in; 5 lbs

– Key Features

• High power InGaAs detection optimized for low PDL and high return loss
• No analog output; digital interface via Agilent mainframe
• Includes magnetic D-shape adapter and safe stand
• Wide wavelength coverage from 850 nm to 1650 nm

– Typical Applications

• High-power laser characterization and testing
• Optical amplifier performance validation
• Component-level optical power measurements in telecommunications and industrial settings

– Compatibility & Integration

Connector adapters available: FC/PC (81000FA), SC/PC (81000KA), E-2000 (81000PA), ST/PC (81000VA), and LC/PC (81003LA). Compatible with all 816xxA series mainframes and interface modules.